Activity for lijat‭

Type	On...	Excerpt	Status	Date
Question	—	Car headlights in a world without electricity In a world like ours in the 1980s, but which for whatever reason does not use any form of electricity. (Either it does not exist or batteries and generators etc have not been invented.) For purposes of the question, diesel engines can be assumed (so no need for electric spark plugs or a replacement)... (more)	—	over 5 years ago
Question	—	How could an earth like planet increase the amount of oxygen in the air How could the amount (total mass) of oxygen be increased on a planet like Earth (with a similar atmospheric composition), preferably by natural processes? For the sake of having a ballpark number, let's try to increase oxygen by 5% of the current mass of the atmosphere. (more)	—	over 7 years ago
Question	—	Where is it most likely that an hexapod creature branched from the evolutionary tree Suppose we have an alternate earth where there in addition to the real species on earth are large hexapod creatures similar to mammals and reptiles. Where on the evolutionary tree is it most likely that they branched of from and why. I came up with the following ideas but feel free to propose other... (more)	—	over 7 years ago
Question	—	How can a vertebrate animal evolve for extended flight before living on land? How could a vertebrate animal evolve for extended flight before evolving land adaptations? Is that even possible at all? By extended flight, I mean breathing air and spending most of their time in the air, similar to sea birds. (more)	—	over 8 years ago